Journal ArticleDOI
Zirconia-coated carbonyl-iron-particle-based magnetorheological fluid for polishing optical glasses and ceramics
Shai N. Shafrir,Henry J. Romanofsky,Michael Skarlinski,Mimi Wang,Chunlin Miao,Sivan Salzman,Taylor Chartier,Joni Mici,John C. Lambropoulos,Rui Shen,Hong Yang,Stephen D. Jacobs +11 more
TLDR
Spot polishing tests were performed on a variety of optical glasses and ceramics over a period of nearly three weeks with no signs of MR fluid degradation or corrosion, and stable material removal rates and smooth surfaces inside spots were obtained.Abstract:
We report on magnetorheological finishing (MRF) spotting experiments performed on glasses and ceramics using a zirconia-coated carbonyl-iron (CI)-particle-based magnetorheological (MR) fluid. The zirconia-coated magnetic CI particles were prepared via sol-gel synthesis in kilogram quantities. The coating layer was ~50-100 nm thick, faceted in surface structure, and well adhered. Coated particles showed long-term stability against aqueous corrosion. “Free” nanocrystalline zirconia polishing abrasives were cogenerated in the coating process, resulting in an abrasive-charged powder for MRF. A viable MR fluid was prepared simply by adding water. Spot polishing tests were performed on a variety of optical glasses and ceramics over a period of nearly three weeks with no signs of MR fluid degradation or corrosion. Stable material removal rates and smooth surfaces inside spots were obtained.read more
Citations
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Journal ArticleDOI
Core–shell-structured silica-coated magnetic carbonyl iron microbead and its magnetorheology with anti-acidic characteristics
TL;DR: In this article, a modified Stober method was used to synthesize silica-coated soft magnetic carbonyl iron (CI) particles through pre-treatment with a grafting agent to enhance the affinity of a precursor of silica.
Journal ArticleDOI
Application of monodisperse Fe3O4 submicrospheres in magnetorheological fluids
TL;DR: In this article, a magnetorheological fluid (MRF) system containing porous mono-disperse magnetite (Fe3O4) spheres synthesized by solvothermal method is demonstrated.
Patent
Methods of finishing an edge of a glass sheet
TL;DR: In this paper, the edge of a glass sheet is machined into a predetermined cross-sectional profile along a plane taken transverse to the edge with an initial average edge strength ESi.
Journal ArticleDOI
Application of Ni-Zn ferrite powders with polydisperse spherical particles in magnetorheological fluids
TL;DR: In this article, the steady-state shear response of polydisperse Ni-Zn ferrite-submicrospheres-based magnetorheological fluids (MRFs) was reported.
Journal ArticleDOI
Carbon nanotube coated magnetic carbonyl iron microspheres prepared by solvent casting method and their magneto-responsive characteristics
TL;DR: In this paper, a dense network of multi-walled carbon nanotubes (MWCNTs) was fabricated on the surface of soft magnetic carbonyl iron (CI) particles by using 4-aminobenzoic acid as a grafting agent through a two-step method: ultrasonication and solvent casting.
References
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CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data
William M Haynes,David R. Lide +1 more
Journal ArticleDOI
Black nonreflecting silicon surfaces for solar cells
TL;DR: In this article, a wet chemical process for nanoscale texturing of Si surfaces is presented, which results in an almost complete suppression of the reflectivity in a broad spectral range, leading to black Si surfaces.
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Laser-induced Damage in Optical Materials
TL;DR: The history of laser-induced damage in optics can be found in this paper, where Soileau et al. present a survey of the laser-induced damage phenomenon in optics.
Proceedings ArticleDOI
Magnetorheological finishing (MRF) in commercial precision optics manufacturing
TL;DR: The magnetorheological finishing (MRF) as mentioned in this paper is a sub-aperture lap process that requires no specialized tooling, because the magnetically-stiffened abrasive fluid conforms to the local curvature of any arbitrarily shaped workpiece.